CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (11,710)	$ 3,004	$ (73,988)	$ (52)
Other comprehensive income (loss):
Foreign currency translation	8,245	(8,726)	3,434	(6,396)
Pension and other postretirement benefit plans, net of tax	(49)	21	282	19,395
Unrealized gain/(loss) on derivative instruments, net of tax	(1,963)	(148)	(2,202)	(2,174)
Comprehensive (loss) income	$ (5,477)	$ (5,849)	$ (72,474)	$ 10,773